Panasonic RX-5025 - Block Diagram

RX-5025 RX-5025
‘MEASUREMENTS
AND
ADJUSTMENTS
m@
ALIGNMENT
INSTRUCTION
_
READ
CAREFULLY
BEFORE
ATTEMPTING
ALIGNMENT
Set volume control to maximum.
. Set tone control to treble. |
.
Set
band
switch
to
AM
or
FM.
. Set balance control to center.
mg AM, FM ALIGNMENT
SIGNAL GENERATOR or
SWEEP GENERATOR
CONNECTIONS | FREQUENCY
Fashion loop of
several turns of
wire and radiate
signal into loop of
receiver.
(3)|
AM
1,500kHz
[100mm
(37/16
)]
(*
1)
Cement
antenna
bobbin
with
wax
after
completing
alignment.
5. Set tape/radio/line selector to radio.
6.
Set
power
source
voltage
to
9V
DC.
7.
Output
of
signal
generator
should
be
no
higher
than
necessary
to
obtain
an
output
reading.
hon —
INDICATOR
(ELECTRONICS
VOLTMETER
or SCOPE)
AM-IF ALIGNMENT
RADIO DIAL
BAND
SETTING
ADJUSTMENT
REMARKS
455 kHz
~ 30% Mod.
at 400 Hz
Point of non-
interference. (on/
about 600 kHz)
Output meter
across voice
coil.
Adjust for maximum
(|
AM
T2
(AM
IFT)
AM-RF ALIGNMENT
550 kHz
[11.0mm
Iie )I
1,500 kHz
L4 (AM OSG
(*1) L3 (AM
ANT Coil)
CT4(AM OSC
Trimmer)
CT3 (AM ANT
Trimmer)
Adjust for maximum
output. Adjust L3 by
moving coil bobbin
along ferrite core.
Adjust for maximum
output.
Repeat steps (2)
and (3).
Output meter
across voice
coil.
ted test points.
3
RENT
302|
Connect vert.
amp. of scope to
test point :
Negative side to
test point Y .
Connect to test
point W through
0.001 .. Negative
side to test point
Point of non-
interference. (on/
about 90MHz)
10.7 MHz
Adjust for maximum
(SWP.)
amplitude.
(Refer to fig. 12.)
T1 (FM 1st IFT)
T3 (FM 2nd IFT) oe
(Refer to fig. 13.)
L2 (FM OSC
Output
meter
;
: Coil) (* 2) Adjust for maxi-
(6)|
FM
Cont
trough
ie
VOIEe
L1
(FM
ANT
mum
output.
FM
dummy
C
ee
eae
406
MHz
CT2
(FM
OSC
(*2)
Adjust
for
maxi-
side
to
test
poin
Trimmer)
mum.
output.
(7))
FM
Vv.
106
Miz
eo
CT1
(FM
ANT
Repeat
steps
16
Trimmer)
(6)
and
(7).
a.
(+2)
Three
output
responses
will
be
present;
proper
tuning
is
the
center
frequency.
FM
ANT
|
were
m
SEPARATION
ALIGNMENT
EQUIPMENT
CONNECTION
ELECTRONIC
COUNTER
ADJUSTMENT
SPECIFICATION
REMARKS
) FM SIGNAL
(SOOKHZ
TEM
GENERATOR
SOURCE
CONNECTION
Adjustment of | 90MHz, 60dB
arde
pilot
signal.
(CW
Mod)
|
m
AUDIO
ADJUSTMENT
|
ITEM
|
INPUT
Me
Nae
SPECIFICATION
at
REMARKS
QZZCFM
.
|
Maximum
Bias
WV
i)
Record
mode
oscillation
WV
ae
=)
70+3kKHz
L301
Beat
proof
switch
>
II
frequency
a
Tape
selector
~
CrO,
Bias
Use
metal
current tape
Ss £4
Adjust VR1, for 19kHz
(+150Hz) reading on
electronics counter.
VR1 19kHz
Record mode
Beat proof switch > Il
| Tape selector > Normal
BLOCK
DIAGRAM
<RADIO>
: IC |
eS
:
|
-
FM IF AMP cF| FT
a
Qo
i
ce
Sere
ee
é
tls
eee
6)—
0000
06
n
=
vn
nn
{s
Oo
m
ml |
<POWER> ANT osc
UM-I| 9V
ih},
T3Ol
REGULATOR
— Q30I
T2 CF2 J
AF AMP VCO
alee @—~ ich ©
L oe
: Rech
FM MONO
AM ses ST
B
St-2
STEREO 4%
IND
D305
@
<PLAYBACK> (Lch)
LINE
IN
co[]
TWEETER
C
BALANCE
VOLUME
(Leh)
oe,
es
Ten
VR30!__-VRIOI
SIQI-1
S10l-
2 (a)_
4
102,103
WOOFER
R/p
HEAD
fe)
O
Za
ones
)
(Loh)
ae
EQ
AMP
|
Q1or
«8l02-
TAPE
AMP
HEADPHONE
<RECORDING> (Lch)
LINE IN
© BALANCE VOLUME
VR301 —-VRIOI
@) 4} aio2,103
= TWEETER
S1I01-2
SIOI-1
A
(Lch)
MIC
é
ar
mer
-
zh
2
Swer®
WOOFER
Lo
==
S102-I
(Loh)
Q308
FILTER
a)
7
|
TAPE
AMP
HEADPH
RipHEAD
@B
EADPHONE
—--
&
SIOI-
7 |
,
ore
Talk
S104
L30l
Oo
ze
|
D310
REC IND
Fig.
11
:
[5]
CPLA REM SHER COMERS bE SEE SRSA
LOYD PRE ELLE DIDS PEELED,